| FileExists {RandomFields} | R Documentation |
The function FileExists checks whether a file or a lock-file
exists
The function LockRemove removes a lock-file
FileExists(file, PrintLevel=RFparameters()$Print) LockRemove(file)
file |
name of the data file |
PrintLevel |
if PrintLevel<=1 no messages are displayed |
FileExists checks whether file or file.lock exists.
If none of them exists file.lock is created and hostname and
PID are written into file.lock. This is useful if several processes
use the same directory. Further, it is checked whether another process
has tried to create the same file in the same instance. In this case
FileExists returns for at least one of the processes that
file.lock has already been created.
FileExists returns
1 |
if file already exists |
2 |
if file.lock already exists |
3 |
if file.lock was tried to be created, but another process
inferred and got priority |
0 |
otherwise, file and file.lock did not exist and
file.lock has been created |
Martin Schlather, martin.schlather@math.uni-goettingen.de http://www.stochastik.math.uni-goettingen.de/institute